Who are some of elite sub woofers?


Looking to replace Klipsch 12d

So many choices.
Ag insider logo xs@2xawooof
Jl fathom  amps seem to have a lot of issues, lots of people report them dying quickly.
Vandersteen 3 with 11 bands of EQ to address room issues below 120 hz singles start at $3k

or the very elite sub 9 in a carbon fiber wrapped low resonance enclosure, also w 11 band EQ, they come in pairs...for about $12k


Thank you all for insight.
Budge I'm guessing $1500 but thought about only one?Millercarbon suggested 3-4? That would change budget considerably.